Stellar Evolution

How can stars be classified?

• By their size only

• By their distance from Earth

• By their colour

• By their age

What does the colour of a star indicate?

• Its distance from Earth

• Its surface temperature

• Its size

• Its age

Tags

NGSS.HS-ESS1-2

Which colour indicates the hottest star?

• Red

• Yellow

• Blue

• White

Tags

NGSS.HS-PS4-4

What is the surface temperature of the coolest stars?

• 30,000 K

• 20,000 K

• 10,000 K

• 3,000 K

Why do red giants appear red?

• They are the hottest stars in the universe

• They are very close to Earth

• They are cool astronomical objects

• They are the smallest stars

What is a nebula?

• A hot ball of gas known as a protostar

• A giant cloud of hydrogen gas and dust

• The final stage of a solar mass star

• A reaction that occurs around the core of a star

What happens as the particles in a nebula are pulled closer together?

• The star becomes a white dwarf

• The density of the protostar decreases

• The temperature of the protostar decreases

• The density of the protostar increases

During the main sequence, a star is considered to be:

• Expanding and cooling

• In equilibrium and stable

• Shrinking and heating up

• Undergoing a series of reactions to form beryllium

Tags

NGSS.HS-ESS1-1

What causes a star to become a red giant?

• The fusion reactions in the core increase

• The star's outer surface starts to cool

• The fusion reactions in the core begin to run out

• The star reaches a white dwarf stage

Tags

NGSS.HS-ESS1-1

What color does a star turn when it becomes a red giant?

• Blue

• White

• Red

• Yellow